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/* Definitions for using variables in GNU Make.
Copyright (C) 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Make is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Codes in a variable definition saying where the definition came from.
Increasing numeric values signify less-overridable definitions. */
enum variable_origin
{
o_default, /* Variable from the default set. */
o_env, /* Variable from environment. */
o_file, /* Variable given in a makefile. */
o_env_override, /* Variable from environment, if -e. */
o_command, /* Variable given by user. */
o_override, /* Variable from an `override' directive. */
o_automatic, /* Automatic variable -- cannot be set. */
o_invalid /* Core dump time. */
};
/* Structure that represents one variable definition.
Each bucket of the hash table is a chain of these,
chained through `next'. */
struct variable
{
struct variable *next; /* Link in the chain. */
char *name; /* Variable name. */
char *value; /* Variable value. */
struct floc fileinfo; /* Where the variable was defined. */
enum variable_origin
origin ENUM_BITFIELD (3); /* Variable origin. */
unsigned int recursive:1; /* Gets recursively re-evaluated. */
unsigned int expanding:1; /* Nonzero if currently being expanded. */
unsigned int per_target:1; /* Nonzero if a target-specific variable. */
unsigned int append:1; /* Nonzero if an appending target-specific
variable. */
enum variable_export
{
v_export, /* Export this variable. */
v_noexport, /* Don't export this variable. */
v_ifset, /* Export it if it has a non-default value. */
v_default /* Decide in target_environment. */
} export ENUM_BITFIELD (2);
};
/* Structure that represents a variable set. */
struct variable_set
{
struct variable **table; /* Hash table of variables. */
unsigned int buckets; /* Number of hash buckets in `table'. */
};
/* Structure that represents a list of variable sets. */
struct variable_set_list
{
struct variable_set_list *next; /* Link in the chain. */
struct variable_set *set; /* Variable set. */
};
extern char *variable_buffer;
extern struct variable_set_list *current_variable_set_list;
/* expand.c */
extern char *variable_buffer_output PARAMS ((char *ptr, char *string, unsigned int length));
extern char *variable_expand PARAMS ((char *line));
extern char *allocated_variable_expand_for_file PARAMS ((char *line, struct file *file));
#define allocated_variable_expand(line) \
allocated_variable_expand_for_file (line, (struct file *) 0)
extern char *expand_argument PARAMS ((char *str, char *end));
extern char *variable_expand_string PARAMS ((char *line, char *string,
long length));
/* function.c */
extern int handle_function PARAMS ((char **op, char **stringp));
extern int pattern_matches PARAMS ((char *pattern, char *percent, char *str));
extern char *subst_expand PARAMS ((char *o, char *text, char *subst, char *replace,
unsigned int slen, unsigned int rlen, int by_word, int suffix_only));
extern char *patsubst_expand PARAMS ((char *o, char *text, char *pattern, char *replace,
char *pattern_percent, char *replace_percent));
/* expand.c */
extern char *recursively_expand PARAMS ((struct variable *v));
/* variable.c */
extern struct variable_set_list *create_new_variable_set PARAMS ((void));
extern struct variable_set_list *push_new_variable_scope PARAMS ((void));
extern void pop_variable_scope PARAMS ((void));
extern void define_automatic_variables PARAMS ((void));
extern void initialize_file_variables PARAMS ((struct file *file, int read));
extern void print_file_variables PARAMS ((struct file *file));
extern void print_variable_set PARAMS ((struct variable_set *set, char *prefix));
extern void merge_variable_set_lists PARAMS ((struct variable_set_list **setlist0, struct variable_set_list *setlist1));
extern struct variable *try_variable_definition PARAMS ((const struct floc *flocp, char *line, enum variable_origin origin, int target_var));
extern struct variable *lookup_variable PARAMS ((char *name, unsigned int length));
extern struct variable *define_variable_in_set
PARAMS ((char *name, unsigned int length, char *value,
enum variable_origin origin, int recursive,
struct variable_set *set, const struct floc *flocp));
/* Define a variable in the current variable set. */
#define define_variable(n,l,v,o,r) \
define_variable_in_set((n),(l),(v),(o),(r),\
current_variable_set_list->set,NILF)
/* Define a variable with a location in the current variable set. */
#define define_variable_loc(n,l,v,o,r,f) \
define_variable_in_set((n),(l),(v),(o),(r),\
current_variable_set_list->set,(f))
/* Define a variable in FILE's variable set. */
#define define_variable_for_file(n,l,v,o,r,f) \
define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
extern char **target_environment PARAMS ((struct file *file));
extern int export_all_variables;
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